# include<iostream>

  using namespace std;
  int main()
  {
        int a,b,c ;

        cout<<"ingrese numero"<<endl;
        cin>>a;
        cout<<"ingrese numero 2"<<endl;
        cin>>b;
        cout<<"ingrese operacion "<<endl;
        cin>>c;

        switch (c)

       {
        case '+':
        cout<<a+b;
        break;
        case '-':
        cout<<a-b;
        break;
        case '*':
        cout<<a*b;
        break;
        case'/':
        if(b==0);
        }
        {
            cout<<"error";
        }
            else
        {
            cout<< a/b;
        }
            break;
            default:
            cout<<"signo invalido";
            break;
  }
  return 1 ;
  }
